Java设计用户注册界面.ppt

1、任务9设计用户注册界面,学习情境二(考试系统单机版),学习目标,掌握JComboBox、JCheckBoxl、JRadioButton组件的创建及ItemEvent事件处理。 掌握JList组件的创建及ListSelectionEvent事件的处理。 熟悉网格包布局管理器、盒式布局的使用及其多种布局方式的综合应用。,9.1 任务描述,9.2 技术要点,选择性组件 选择事件 复杂布局管理器,选择性组件组合框（JComboBox类）,选择性组件列表框（JList类）,选择性组件单选按钮（JRadioButton类）,选择性组件复选框（JCheckbox类）,选择事件ItemEvent类,举例 It

2、emeventDemo.java,1 import java.awt.*; 2 import java.awt.event.*; 3 import javax.swing.*; 4 public class ItemeventDemo extends JFrame implements ItemListener,ActionListener 5 JRadioButton opt1; 6 JRadioButton opt2; 7 ButtonGroup btg; 8 JTextArea ta; 9 JComboBox comb; 10 JLabel sex,city; 11 public Ite

3、meventDemo(String title) 12 super(title); 13 setLayout(new FlowLayout(FlowLayout.LEFT); 14 sex=new JLabel(性 别: ); 15 city=new JLabel( 籍 贯:); 16 opt1=new JRadioButton( 男 ); 17 opt2=new JRadioButton( 女 ); 18 btg=new ButtonGroup(); 19 btg.add(opt1); 20 btg.add(opt2); 21 opt1.addItemListener(this); 22 o

4、pt2.addItemListener(this);,23 ta=new JTextArea (8,35); 24 comb=new JComboBox(); 25 comb.addItem(北 京); 26 comb.addItem(上 海); 27 comb.addItem(南 京); 28 comb.addItem(广 州); 29 comb.addItem(成 都); 30 comb.addItem(昆 明); 31 comb.addItemListener(this); 32 comb.addActionListener(this); 33 getContentPane().add(

5、sex); 34 getContentPane().add(opt1); 35 getContentPane().add(opt2); 36 getContentPane().add(city); 37 getContentPane().add(comb); 38 getContentPane().add(ta); 39 setTitle(title); 40 setSize(300,250); 41 setVisible(true); 42 ,举例 ItemeventDemo.java（续）,举例 ItemeventDemo.java（续）,43 public static void mai

6、n(String args) 44 new ItemeventDemo(Itemevent Demo); 45 46 / ItemEvent事件发生时的处理操作 47 public void itemStateChanged(ItemEvent e) 48 String str; 49 if(e.getSource()=opt1) / 如果是opt1被选择 50 ta.append(n性 别：+男); 51 else if(e.getSource()=opt2) / 如果opt2被选择 52 ta.append(n性 别：+女); 53 if(e.getSource()=comb) 54 st

7、r=comb.getSelectedItem().toString(); 55 ta.append(n籍 贯:+str+ =ItemEvent事件 ); 56 57 58 public void actionPerformed(ActionEvent e) 59 String str; 60 if(e.getSource()=comb) 61 str=comb.getSelectedItem().toString(); 62 ta.append(n籍 贯:+str+ =ActionEvent事件 ); 63 64 65 ,运行效果,举例CheckBoxDemo .java,1 import j

8、ava.awt.*; 2 import java.awt.event.*; 3 import javax.swing.*; 4 public class CheckBoxDemo extends JFrame implements ItemListener 5 private JTextField field; 6 private JCheckBox bold, italic; 7 private int valBold = Font.PLAIN; 8 private int valItalic = Font.PLAIN; 9 public CheckBoxDemo() 10 super( J

9、CheckBox Demo ); 11 Container container = getContentPane(); 12 container.setLayout( new FlowLayout() ); 13 field = new JTextField( 2008，北京欢迎您！, 20 ); 14 field.setFont( new Font( 隶书, Font.PLAIN, 14 ) ); 15 container.add(field ); 16 bold = new JCheckBox( Bold );,17 container.add( bold ); 18 italic = n

10、ew JCheckBox( Italic ); 19 container.add( italic ); 20 bold.addItemListener(this); 21 italic.addItemListener( this ); 22 setSize( 280, 100 ); 23 setVisible( true ); 24 25 public void itemStateChanged(ItemEvent event) 26 if ( event.getSource() = bold ) 27 valBold = bold.isSelected() ? Font.BOLD : Fon

11、t.PLAIN; 28 if ( event.getSource() = italic ) 29 valItalic = italic.isSelected() ? Font.ITALIC : Font.PLAIN; 30 field.setFont( new Font( 隶书, valBold + valItalic, 14 ) ); 31 32 public static void main(String args) 33 new CheckBoxDemo(); 34 35 ,选择事件 ListSelectionEvent类,首先必须声明实现监听者对象的类接口ListSelectionLi

12、stener，并通过JList类的addListSelectionListener( )方法注册文本框的监听者对象， 在ListSelectionListener接口的valueChanged (ListSelectionEvent e)方法体中写入有关代码，就可以响应ListSelectionEvent事件。,例9-3 JListDemo.java,1 import java.awt.*; 2 import java.awt.event.*; 3 import javax.swing.*; 4 import javax.swing.event.*; 5 public class JListD

13、emo extends JFrame implements ListSelectionListener 6 JList list = null; 7 JLabel label = null; 8 String s = 宝马,奔驰,奥迪,本田,皇冠,福特,现代; 9 public JListDemo() 10 JFrame f = new JFrame(JList Demo); 11 Container contentPane = f.getContentPane(); 12 contentPane.setLayout(new BorderLayout(0,15); 13 label = new

14、 JLabel( ); 14 list = new JList(s); 15 list.setVisibleRowCount(5); 16 list.setBorder(BorderFactory.createTitledBorder(汽车品牌：);,17 list.addListSelectionListener(this); 18 contentPane.add(label,BorderLayout.NORTH); 19 contentPane.add(new JScrollPane(list),BorderLayout.CENTER); 20 f.setSize(300,200); 21

15、 f.setVisible(true); 22 23 public static void main(String args) 24 new JListDemo(); 25 26 public void valueChanged(ListSelectionEvent e) 27 int tmp = 0; 28 String stmp = 您喜欢的汽车品牌有: ; 29 int index = list.getSelectedIndices(); 30 for(int i=0; i index.length ; i+) 31 tmp = indexi; 32 stmp = stmp+stmp+

16、; 33 34 label.setText(stmp); 35 36 ,运行效果,复杂布局管理器 网格包布局（GridBagLayout类）,举例 GridBagLayoutDemo.java,1 import java.awt.*; 2 import javax.swing.*; 3 public class GridBagLayoutDemo extends JFrame 4 protected void addbutton(String name,GridBagLayout gridbag, 5 GridBagConstraints c) 6 JButton button = new J

17、Button(name); 7 gridbag.setConstraints(button, c); 8 getContentPane().add(button); 9 10 public GridBagLayoutDemo() 11 GridBagLayout gridbag = new GridBagLayout(); 12 GridBagConstraints c = new GridBagConstraints(); 13 setFont(new Font(SansSerif, Font.PLAIN, 14); 14 setLayout(gridbag); 15 c.fill = Gr

18、idBagConstraints.BOTH; 16 c.weightx = 1.0; 17 addbutton(Button1, gridbag, c); 18 addbutton(Button2, gridbag, c); 19 addbutton(Button3, gridbag, c); 20 c.gridwidth = GridBagConstraints.REMAINDER; /最后一个组件 21 addbutton(Button4, gridbag, c); 22 c.weightx = 0.0; /恢复默认值 44 ,23 addbutton(Button5, gridbag,

19、c); 24 c.gridwidth = GridBagConstraints.RELATIVE; /倒数第二个组件 25 addbutton(Button6, gridbag, c); 26 c.gridwidth = GridBagConstraints.REMAINDER; /最后一个组件 27 addbutton(Button7, gridbag, c); 28 c.gridwidth = 1; /恢复默认值 29 c.gridheight = 2; /占据两行 30 c.weighty = 1.0; 31 addbutton(Button8, gridbag, c); 32 c.we

20、ighty = 0.0; /恢复默认值 33 c.gridwidth = GridBagConstraints.REMAINDER; /最后一个组件 34 c.gridheight = 1; /恢复默认值 35 addbutton(Button9, gridbag, c); 36 addbutton(Button10, gridbag, c); 37 38 public static void main(String args) 39 GridBagLayoutDemo window = new GridBagLayoutDemo(); 40 window.setTitle(GridBagLa

21、yout Demo); 41 window.pack(); 42 window.setVisible(true); 43 ,复杂布局管理器 盒式布局（BoxLayout类）,3种隐藏的组件做间隔： Strut(支柱)：用来在组件之间插入固定的空间。 Glue(胶水)：用来控制一个框布局内额外的空间。 Ridid area(硬区域)：用来生成一个固定大小的区域。,举例 BoxLayOutDemo.java,1 import java.awt.*; 2 import javax.swing.*; 3 public class BoxLayOutDemo 4 public static void m

22、ain(String args) 5 MyFrame f=new MyFrame(); 6 f.setVisible(true); 7 8 9 class MyFrame extends JFrame 10 public MyFrame() 11 super(BoxLayout DEMO ); 12 final int NUM=2; 13 setBounds(500,350,300,200); 14 Container c =getContentPane(); 15 c.setLayout(new BorderLayout(20,20); /设置边框布局 16 Box boxes = new Box4; /设置盒式布